Windows Media format video, just listen to the sound. I JUST picked up the car this afternoon, this is from the front of the rear passenger tire:

http://activetuning.homelinux.com/vi...ning/issue.wmv

 

I can't even really make out what's on the video. Sounds like air leaking out or something. Maybe you have a nail in the tire?

 

Noise only happens when the car the engine is on....

I noticed something wierd when I was in 1st gear moving slow and it seemed like there was some sort of grinding sound coming from the catback area of the exhaust, or somewhere underneath the car in that vicinity. Also, when I turn the engine off, there is some sort of rattling from the same area that occurs.

 

I remember when I first got my Z, I would hear a clicking sound coming from the exhaust/cats for a few minutes after I turned off my car. I was told that it was just the sound of the exhaust cooling, but I don't know about the other sounds you're hearing.

 

This is definitely something else. One of the sounds is some sort of rattling sound. Hopefully they'll have time to take a look at it tomorrow, but I will not accept that as answer from Nissan.

 

Fuel pump. At least that's what I've read on this board. I have the same sound.